# # lasground.py # # (c) 2013, martin isenburg - http://rapidlasso.com # rapidlasso GmbH - fast tools to catch reality # # uses lasground.exe to extract bare-earth points of # a LiDAR file. classifies points into ground (class 2) # and non-ground points (class 1). # # LiDAR input: LAS/LAZ/BIN/TXT/SHP/BIL/ASC/DTM # LiDAR output: LAS/LAZ/BIN/TXT # # for licensing see http://lastools.org/LICENSE.txt # import sys, os, arcgisscripting, subprocess def return_classification(classification): if (classification == "created, never classified (0)"): return "0" if (classification == "unclassified (1)"): return "1" if (classification == "ground (2)"): return "2" if (classification == "low vegetation (3)"): return "3" if (classification == "medium vegetation (4)"): return "4" if (classification == "high vegetation (5)"): return "5" if (classification == "building (6)"): return "6" if (classification == "low point (7)"): return "7" if (classification == "keypoint (8)"): return "8" if (classification == "water (9)"): return "9" if (classification == "high point (10)"): return "10" if (classification == "(11)"): return "11" if (classification == "overlap point (12)"): return "12" if (classification == "(13)"): return "13" if (classification == "(14)"): return "14" if (classification == "(15)"): return "15" if (classification == "(16)"): return "16" if (classification == "(17)"): return "17" if (classification == "(18)"): return "18" return "unknown" def check_output(command,console): if console == True: process = subprocess.Popen(command) else: process = subprocess.Popen(command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, universal_newlines=True) output,error = process.communicate() returncode = process.poll() return returncode,output ### create the geoprocessor object gp = arcgisscripting.create(9.3) ### report that something is happening gp.AddMessage("Starting lasground ...") ### get number of arguments argc = len(sys.argv) ### report arguments (for debug) #gp.AddMessage("Arguments:") #for i in range(0, argc): # gp.AddMessage("[" + str(i) + "]" + sys.argv[i]) ### get the path to LAStools lastools_path = os.path.dirname(os.path.dirname(os.path.dirname(sys.argv[0]))) ### make sure the path does not contain spaces if lastools_path.count(" ") > 0: gp.AddMessage("Error. Path to .\\lastools installation contains spaces.") gp.AddMessage("This does not work: " + lastools_path) gp.AddMessage("This would work: C:\\software\\lastools") sys.exit(1) ### complete the path to where the LAStools executables are lastools_path = lastools_path + "\\bin" ### check if path exists if os.path.exists(lastools_path) == False: gp.AddMessage("Cannot find .\\lastools\\bin at " + lastools_path) sys.exit(1) else: gp.AddMessage("Found " + lastools_path + " ...") ### create the full path to the lasground executable lasground_path = lastools_path+"\\lasground.exe" ### check if executable exists if os.path.exists(lastools_path) == False: gp.AddMessage("Cannot find lasground.exe at " + lasground_path) sys.exit(1) else: gp.AddMessage("Found " + lasground_path + " ...") ### create the command string for lasground.exe command = ['"'+lasground_path+'"'] ### maybe use '-verbose' option if sys.argv[argc-1] == "true": command.append("-v") ### counting up the arguments c = 1 ### add input LiDAR command.append("-i") command.append('"'+sys.argv[c]+'"') c = c + 1 ### maybe no airborne LiDAR if sys.argv[c] != "true": command.append("-not_airborne") c = c + 1 ### maybe horizontal feet if sys.argv[c] == "true": command.append("-feet") c = c + 1 ### maybe vertical feet if sys.argv[c] == "true": command.append("-elevation_feet") c = c + 1 ### what type of terrain do we have if sys.argv[c] == "wilderness": command.append("-wilderness") elif sys.argv[c] == "city or warehouses": command.append("-city") elif sys.argv[c] == "towns or flats": command.append("-town") elif sys.argv[c] == "metropolis": command.append("-metro") c = c + 1 ### what granularity should we operate with if sys.argv[c] == "fine": command.append("-fine") elif sys.argv[c] == "extra fine": command.append("-extra_fine") elif sys.argv[c] == "ultra fine": command.append("-ultra_fine") c = c + 1 ### maybe we should ignore/preserve some existing classifications when classifying if sys.argv[c] != "#": command.append("-ignore_class") command.append(return_classification(sys.argv[c])) c = c + 1 ### maybe also ignore/preserve some other existing classifications when classifying if sys.argv[c] != "#": command.append("-ignore_class") command.append(return_classification(sys.argv[c])) c = c + 1 ### maybe we should compute the heights (e.g. for subsequent lasclassify) if sys.argv[c] == "true": command.append("-compute_height") c = c + 1 ### maybe we should height-normalize the LiDAR (e.g. for subsequent canopy creation) if sys.argv[c] == "true": command.append("-replace_z") c = c + 1 ### maybe an output format was selected if sys.argv[c] != "#": if sys.argv[c] == "las": command.append("-olas") elif sys.argv[c] == "laz": command.append("-olaz") elif sys.argv[c] == "bin": command.append("-obin") elif sys.argv[c] == "xyzc": command.append("-otxt") command.append("-oparse") command.append("xyzc") elif sys.argv[c] == "xyzci": command.append("-otxt") command.append("-oparse") command.append("xyzci") elif sys.argv[c] == "txyzc": command.append("-otxt") command.append("-oparse") command.append("txyzc") elif sys.argv[c] == "txyzci": command.append("-otxt") command.append("-oparse") command.append("txyzci") c = c + 1 ### maybe an output file name was selected if sys.argv[c] != "#": command.append("-o") command.append('"'+sys.argv[c]+'"') c = c + 1 ### maybe an output directory was selected if sys.argv[c] != "#": command.append("-odir") command.append('"'+sys.argv[c]+'"') c = c + 1 ### maybe an output appendix was selected if sys.argv[c] != "#": command.append("-odix") command.append('"'+sys.argv[c]+'"') c = c + 1 ### maybe there are additional input options if sys.argv[c] != "#": additional_options = sys.argv[c].split() for option in additional_options: command.append(option) ### report command string gp.AddMessage("LAStools command line:") command_length = len(command) command_string = str(command[0]) command[0] = command[0].strip('"') for i in range(1, command_length): command_string = command_string + " " + str(command[i]) command[i] = command[i].strip('"') gp.AddMessage(command_string) ### run command returncode,output = check_output(command, False) ### report output of lasground gp.AddMessage(str(output)) ### check return code if returncode != 0: gp.AddMessage("Error. lasground failed.") sys.exit(1) ### report happy end gp.AddMessage("Success. lasground done.")